Process of silk-printing.



N0. 7ll,835, Patented Un t. 21, I902.

M. DUCAT, C. J. A. MARNAS &. L. H. DEHUFF. PROCESS OF SILK PRINTING.

(Applicatiqn filed sa 1900.

(No Model.)

Fig.1.

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UNITED STATES PATENT OFFICE.

MATI-IIEU DUOA'I, OF NEUVILLE-sUR-sAONE, AND CHARLES JEAN ANTOINE MARNAs, OF LYONs, FRANCE, AND LEOPOLD HEINRICH DEHOFF, OF LUDWIGSHAFEN, GERMANY, ASSIGNORS TO THE BADISCHE ANILIN & sODA FABRIK, OF LUDwIesIIA EN, GERMANY, A CORPORATION.

PROCESS OF SILK-PRINTING.

SPECIFICATION forming part of Letters Patent No. 711,835, dated October 21, 1902.

Application filed September 6, 1900.

To all whom it may concern:

Be it known that we,MATHIEU DUOAT, dyer, residing at Neuville-sur-Sane, and CHARLES JEAN ANTOINE MARNAS, dyer, residing at Lyons, France, citizens of the French Republie, and LEOPOL HEINRICH DEHOFF, doctor of philosophy and chemist, a subject of the King of Saxony,residing at Ludwigshafen-onthe-Rhine, in the Kingdom of Bavaria, Germany, have invented a new Process of Silk- Printing, of which the following is a specification.

The object of this invention is to obtain prints consisting of a dull background and a I 5 glossy design or the reverse on fabric consisting of or containing raw silk. Such patterns have hitherto been obtained only by weaving together raw and, degummed silk in appropriate manner, and consequently in such fabric the separate and individual threads each consist entirely of either raw or degummed silk. Now we have discovered that patterns of this kind can be obtained by locally degumming the raw silk, and this may be acz 5 complished by printing the design by means of a paste containinga caustic alkali-forinstance, caustic s0daand then subjecting the so printed material to proper subsequent treatment; but we have also found that unless great care be exercised in this process the action of the caustic alkali is very apt to go beyond the mere removal of the silk-gum and to attack the silk fiber itself, thus reducingits strength. We have further discovered that this action of the caustic alkali can be so modified'that the gum is removed and the strength of the silk fiberis not affected; This we do by adding to the degumming-paste some such substance as will limit the action of the 40 paste to the gum. We have found that grapesugar or glycerin possesses this property, and therefore a suitable paste can be made by adding to the caustic-soda paste grape-sugar or glycerin. In the following we will refer to grape-sugar or glycerin as limiting agent. For our purposewe can use either dyed or undyed fabric. If the fabric is dyed and the Serial No. 29,182- (No specimens.)

shade of the printed goods is to remain unr also discovered that the above-mentioned de signs can be made on silk fabric by printing such reserves on the fabric, which when dried or steamed are indifferent to the action of alkali, and by then passing the so-printed fabric through a bath containing caustic alkali, such as caustic soda, and a substance which will limit the action of the bath to the silk-gum, such as grape-sugar or glycerin. Among such reserves we may mention chrome acetate. The reserves likewise may contain appropriate coloring-matter.

In the'following examples we illustrate the nature of our invention and how it may best be carried into efiect; but we do not wish to be understood as limiting our invention to these examples. The parts are by weight:

Example 1--Prz'nting a degnmming-paste containing caustic soda. Make a paste of two hundred (200) parts of British gum and four hundred (400) parts of hot water. 0001 and add four hundred (400) parts of caustic-soda solution of forty (40)degrees Baum. Print this paste upon dyed or undyed raw silk, dry at a moderate temperature-say thirtyfive (35) degrees .centigrade-rinse, and, if desirable, pass through an acid-bath. The so-prepared material can be dyed in the usual manner, if desired.

Example Q-Printing a degumming-pastc containing caustic soda and a limiting agent- Introduce one hundred (100) parts Of British gum in the usual mannerinto seven hundred (700) parts of caustic-soda solution of forty (40) degrees Baum. Prepare also a mixture of three hundred (300) parts of grape-sugar in one hundred (100) parts of water by heating on a water-bath, stir until cool, and pour into the British gum caustic-soda paste and bring up to twelve hundred (1,200) parts by addition of water, if necessary. Print this paste and finish the material as in Example 1.

Example awmzm a degumming-paste containing caustic soda, a limiting agent, and a colcring-matter.(A) Make a paste of ten parts of anthraquinone black and forty parts of cold water; also, mix sixty parts of British gum with sevenhundred (700) parts of caustic-soda. solution of forty (40) degrees Baum, and add to this, as in Example 2, three hundred (300) parts of grape-sugar mixed with ninety parts of water. Mix all these and bring up to twelve hundred (1,200) parts by addition of water, if necessary. Print and finish as in Example 1.

(B) Introduce sixty ('60) parts of British gum into seven hundred (7 00) parts of causticsoda solution of forty (40) degreesBaum. Add thirty (30) parts of indigo J. Prepare also a mixture of three hundred (300) parts of grape-sugar and one hundred parts of water by heating on a water-bath. Stir until cool and pour into the British gum indigo J and caustic-soda paste and bring up to twelve hundred (1,200) parts by addition of water,

- if necessary. Print this paste and finish the material as in Example 1.

Example 4Printinga reserve and locally degamm'lng by means of caustic soda and a limiting agent.Mix five hundred and fifty 550) parts of hot water with three hundred 300) parts'of British gum. Cool and add one hundred and fifty parts of a solution of chrome acetate of twenty (20) degrees Baum and makeup to one thousand (1,000) parts by addition of water. Print this paste onto the material, dry, and then pass through a bath containing three hundred (300) parts of glycerin, two hundred(200) parts of water, seven hundred (700) partsof caustic-soda solution of forty (40) degrees Baum for from two (2) to five (5) minutes. Then rinse well in running water.

In the annexed drawings are shown two pieces of silk.

In Figure 1 the body or main part of the piece is glossy, while a part thereof-say a flower or any other figure-is dull, while in Fig. 2 the main part'of the piece of silk is dull and a portion is glossy.

What is claimed is 1. As a new article of manufacture, fabric containing locally-degummed silk.

2. As a new article of manufacture, fabric containing locally-'degummed silk whereby a surface design is produced.

3. The process of locally degumming silk which consists in the application of caustic alkali and a limiting agent to part only of undegummed silk.

4. The process of locally degumming silk which consists in the application of caustic alkali to part only of undegummed silk.

5. The process-0f locally degumming silk which consists in the application of caustic soda and a limiting agent to part onlyof undegummed silk.

6. The process of locally degumming silk, which consists in the application of caustic soda and grape-sugar to part only of nude gummed silk.

7. The process of locally degumming silk which consists in the application of caustic soda to part only of undegummed silk.

. In testimony whereof We have hereunto set our hands in the presence of two subscribing witnesses.

lllAlHlEU DUCA'l. CHARLES JEAN ANTOINE MARNAS. LEOPOLD HEINRICH DEHOFF.

Witnesses for Ducat and Marnas:

HUMBERT LOUIS, ANTOINE S. LOCHEL.

Witnesses for Leopold Heinrich Dehoff:

ERNEST G. EHRHARDT, JACOB ADRIAN. 

